Abstract: An ultrasonic transducer holder, which is an embodiment, has a detachable container for containing a liquid sample, and transmits an ultrasonic wave. The ultrasonic transducer holder includes an ultrasonic transducer that emits an ultrasonic wave, and a protective layer that is fixed to the ultrasonic transducer and transmits the ultrasonic wave to the container. The protective layer includes a first surface that is a surface to which the ultrasonic transducer is fixed, and a second surface that is a back surface of the first surface and is designed to fix the container via a contact medium.

Abstract: An arithmetic expression used for estimating a target item of a specimen is more easily incorporated into an optical measurement system. An optical measurement instrument includes an optical analysis unit configured to perform an optical analysis on a specimen and measure an intensity of light as a result of the optical analysis, and an arithmetic processing unit configured to download an arithmetic expression from a server device via a network, and perform a quantitative analysis on a target substance contained in the specimen by substituting the result of the optical analysis by the optical analysis unit into the arithmetic expression.